If a stream has a 1% annual probability of flooding, what is the recurrence interval for that stream?
A)once every 100 years
B)once every 50 years
C)once every 10 years
D)once every year

Question

Quizplus · Accepted Answer

The recurrence interval is the average time between floods of a certain magnitude or probability. In this case, the stream has a 1% chance of flooding in any given year, which means there is a 1 in 100 chance of a flood occurring in a particular year. Therefore, the recurrence interval is once every 100 years.

If a Stream Has a 1% Annual Probability of Flooding